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M7 > 7.18 D Meg > Flashcards

7.18 D Meg Flashcards

1
Q

Jobs are split up in what 3 areas

A

Preparation
Safety
The task in hand

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2
Q

What should you do when working in electrical equipment

A

Disconnect or Trip C/Bs
Disconnect batteries

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3
Q

What should you do when working in any pressurised systems

A

De pressurise them

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4
Q

How do you remove rivets

A

Use a drill the same size as the rivet diameter

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5
Q

How can you remove welded areas

A

Melt the weld

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6
Q

How do you take apart adhesive areas

A

Destroy the bond

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7
Q

What should you do after re assembly

A

Always test it

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8
Q

What is Cat B not allowed to do

A

Authorise to certify manufactur or aircraft

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9
Q

When paint in metal to metal areas is removed what stripper should you us

A

Only one that is stipulated in the AMM

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10
Q

What is the purpose of a sealant

A

Used to contain fuel, maintain cabin pressure, reduce fire hazards, exclude moisture, prevent corrosion and fill gaps

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11
Q

What is the consistently of a sealant

A

Applied as wet and then cured to a rubbery solid compound

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12
Q

What are the four levels of sealing

A

Absolute
Extensive
Intermediate
Limited

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13
Q

What is fillet seal

A

Applied at edges of structural joints
(Must be on both sides of seam) (use with a gun)

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14
Q

What should you do if a fillet seal has air bubble in

A

They must be worked out

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15
Q

What are injection seals

A

Applied to fill channels and holes that occur due to structural design

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16
Q

What should you do when using an air gun

A

Never fulling empty it to prevent air in the sealant

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17
Q

What is faying surface sealant

A

A layer of sealant sandwiched between two fastened mating surfaces

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18
Q

What is the purpose of faying surface sealant

A

To prevent corrosion and leak trancing in fuel tank

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19
Q

What is a aerodynamic smoother sealant used on

A

A/c exterior skin gals are filled and surface fares for aerodynamic smoothness

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20
Q

What material should you nit use aerodynamic smoothness on until is is hard and tough

A

Zinc- chromate until primer is hard and tough

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21
Q

What is fastener seal used for

A

A variation of one of the basic sealing processes

22
Q

What is prepack seal

A

Used to fill structural cavities that are enclosed after assembly and can’t be injected properly

23
Q

How are brush coat seals put in place

A

By brushing the sealant into place

24
Q

What is a seal plane

A

Structural boundary where the continuity of the seal is established (barrier beyond which the fuel can’t pass)

25
Q

What is a seal compound

A

Synthetic rubber materials that are applied in a flow consistency and then cure by chemical reaction into a solid

26
Q

What are the two categories of a compound

A

Silicone and non silicone

27
Q

What are the characteristics of silicone

A

Normally white, red or grey and used where heat resistance is required

28
Q

What are the characteristics of non silicone

A

An6 colour, used where heat resistance is not required

29
Q

What are the classifications of sealants

A

A- F

30
Q

What is a Class A sealant

A

Brush coat sealant

31
Q

What is a Class B sealant and what is it

A

Filleting sealant
Heavy consistency with low slump properties

32
Q

What is a Class C sealant and what is it

A

Faying surface sealant
Medium consistency for good spreadability

33
Q

What is a Class D sealant

A

Hole filling sealant
Similar consistency to B

34
Q

What is a Class E and F sealant

A

Sprayable sealant

35
Q

What is the application time

A

When the sealant has thawed and can be used (in hours)

36
Q

What is not applicable for a one part sealant

A

The application time

37
Q

What is the squeeze out life

A

After thawing during which a faying sealant can be squeezed out of a joint when fasteners are installed

38
Q

What is the tack free time

A

After thawing the sealnt has cured sufficiently so will not transfer to the finger or plastic film

39
Q

What is the cure time

A

Time for sealant to cure firmly enough that can be handled without damage

40
Q

What can accelerate the cure time

A

Heat

41
Q

What temperature do a sealant start to bubble at

A

120 degrees FARENHEIGHT

42
Q

For fastener sealing in a fuel tank what is used

A

Metal seal caps normally aluminium

43
Q

How can you tell that a two part sealant is mixed properly

A

Even colour throughout

44
Q

What could incomplete mixing cause

A

May affect cure time and performance

45
Q

What are the three methods of mixing

A

Hand mixing
Machine mixing
Cartilage hand mixing

46
Q

Can you re freeze a sealant

A

No

47
Q

What could happen if you use a cold sealant instead of a room temp sealant

A

Will not adhere to the structure

48
Q

What is the most common cartilage hand mixing

A

SEMKIT two part material injection

49
Q

What are the two stages of cleaning before sealing

A

Preliminary cleaning
(Removal using a stiff brush and solvent)
Final cleaning
(Dampen clean wiping material)

50
Q

What temperature should you make sure the material you are sealing to is before sealing

A

5p degrees Fahrenheit

M7 (15 decks)

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